a/c blower motors
Team Owner
Joined: Aug 2006
Posts: 24,125
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From: Columbia Missouri
Take out the old fan, and buy a new C4 fan. I think they are like $15. Find a couple .5" cutting boards from Harbor Freight, and use the template below to make your cutout. Glue the two together so you have a 1" spacer. Drill holes and pin location, and mount the fan. The fans are the same size except the new fan's blades are more, and higher pitch. For even better results...install a relay for the new fan, powered by the alt's BAT terminal, and use the original fan power wire to trigger the relay.
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
Take out the old fan, and buy a new C4 fan. I think they are like $15. Find a couple .5" cutting boards from Harbor Freight, and use the template below to make your cutout. Glue the two together so you have a 1" spacer. Drill holes and pin location, and mount the fan. The fans are the same size except the new fan's blades are more, and higher pitch. For even better results...install a relay for the new fan, powered by the alt's BAT terminal, and use the original fan power wire to trigger the relay.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
i used a cap for a bot belly stove pipe. a end cap, menards for 5 bucks, traced the fan mount on the end amd cut out with tin snips,used a vaccume line slit lengthwise for a gasket-----------------------------------------------
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Instructor
Joined: Sep 2006
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From: Fort Lauderdale FL
Check your local salvage yard. I was out two days ago, and I swear, every GM car that I came across from the mid 60's through late 80's use the same blower motor assembly. The larger land yatchs, Olds. Cadillacs etc use a slightly large blower wheel/fan but designed to fit the same blower motor and OD. These can be had for a couple of bucks and will improve airflow, best of all buy the whole thing and just plug and play, same mounting and electrical hook-up as what you have.
Team Owner
Joined: Oct 2004
Posts: 23,831
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From: Springfield MO
St. Jude Donor '07
Someone sectioned their case and 'glassed it back together so that the C4 fan fit naturally. It had the added benefit of unshrouding the A/C evaporator.
The thread should be in the archives: http://forums.corvetteforum.com/show....php?t=1603168
The thread should be in the archives: http://forums.corvetteforum.com/show....php?t=1603168
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Safety Car
Joined: Jun 2002
Posts: 4,135
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if you use the cap for a stove pipe,its 2'' long,so all you have to do is trim 1/2 of a inch off the length,because the new squirrell cage is 1-1/2''longer,,,,and on the face of the cap trace out the form of the blower housing and cut it out, thats it,,,of corse you will need longer screws,,once you paint it black you can barely notice that it was extended,like i said i used a vaccume line slit lengthwise for a gasket,,,total cost without the blowermotor was 5 bucks for this mod,,,i bought the blower motor and deeper squirrell cage from carquest it was a bravo blower motor,,not only is the squirrell cage deeper but the fins on it are angeled more to improve the airflo--i still had a minor leak so i used dum-dum where the 2 pieces join-------------------------------------
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Team Owner
Joined: Aug 2006
Posts: 24,125
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From: Columbia Missouri
Just pull a C4 fan from a salvage yard and take the blades. I don't know why you would want to do that though...the motors are not that much different...it's the blades that make the big difference.
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fred68 could you switch wires to make fan turn the other way that is how to change directions on cooling fans mounted in front or behind the radiator